Updated info.
T2 handles some of the airlines that are part of SkyTeam: Aeromexico, Continental, Delta and NorthWest so far, plus Aeromar, a regional airline.
On the second level after you check in at the counter, you can spend some time at the fast food court which is to the Right side of the round about, just before the parking lot. Around the airport there are several convenience stores (7-eleven and Oxxo) for a quick snack at lower prices than the costly restaurants.
There is a temporary museum showroom with interesting offerings. If you need banking services, there are several branches on the lower level.
Finally the architects and authorities got the idea of a two level building, upper level is for departures and lower for arrivals. If you see the building from the roundabout for cars, Domestic is on the Left and International on the Right.
T2 is linked to T1 by an Automated People Mover (APM) that takes around seven minutes to do the trip each way but, as there is just single track laid, it requires around 10 minutes to unload and load the wagons. Only passenger holding a printed itinerary or boarding pass are allowed to take the train, and only if you a traveling towards your departure terminal.
T2 has it's own access roads and parking areas, so you don´t need to go to T1 for any other thing than a connecting flight. There is even a Metro subway station nearby (but not easily accessible on foot).